MCQ Questions for Class 11 Medical Biology Photosynthesis In Higher Plants Quiz 16

How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to

$CO_{2}$ and

$H_{2}O$ yields

$686$ kcal and useful chemical energy available in the high energy phosphate bond of one mole of ATP is 12 kcal?

0%
Fifty-seven
0%
One
0%
Two
0%
Thirty

Find out the correct combinations concerning components of photosynthetic electron transport, location in relation to thylakoid and action.
I. OEC - Iumen side - water reduction.
II. Plastocyanin - lumen side - electron transfer from cyt f to PSI.
III. Ferrodoxin - stroma side - reduction of

$NAD^+$ to

$NADH$ .
IV. Cytochrome complex - integral protein - transfer electrons from

$PQH_2$ to PC.
Choose the correct answer.

0%
II and IV
0%
I and III
0%
II and III
0%
I and IV.

Product of photorespiration is

0%
Phosphoglycerate
0%
Erythrose 4-phosphate
0%
Dihydroxy acetone 3-phosphate
0%
All of the above

The microelement which is an integral part of electron carrier that transfers electrons from cyt b-f complex to PS I is also a component of

0%
Nitrate reductase
0%
Cytochrome c-oxidase
0%
IAA-oxidase
0%
Dinitrogenase

Light reaction in stroma lamellae of chloroplast results in the production of

0%
ATP
0%
NADPH $_2$
0%
ATP + NADPH $_2$
0%
O $_2$

Explanation

$\textbf{Correct Option C}$

$\textbf{Solution}$

$\bullet$ The light reaction is the process through which the energy is produced by the plants and other photosynthetic organisms.

$\bullet$ The light reaction takes place in the stroma lamella of the chloroplast. It is also known as photo phosphorylation and it is carried out by photosystem I for PS I.

$\bullet$ Photosystem I is an integral membrane protein which utilizes the light energy to carryout the catalysts of the transfer of electrons across the thylakoid membrane.

$\bullet$ Now during the process of light reaction both ATP as well as NADPH2 are produced along with oxygen.

$\bullet$ So the correct option is C.

Electron energy is used to drive protons against concentration gradient across thylakoid membrane into

0%
Stroma lamella
0%
Thylakoid lumen
0%
Stroma
0%
Interthylakoid space

The idea of two pigment systems in light reaction of photosynthesis was given by

0%
Arnon
0%
Hill
0%
Blackman
0%
None of the above

Synthesis of one glucose molecule requires reduced NADP molecules

0%
6
0%
12
0%
18
0%
24.

Explanation

Synthesis of one glucose molecules requires 12 NADP molecules to reduce because the Calvin cycle a pathway of reduction of CO

$_2$ for the continuous and uninterrupted functioning requires a regular supply of ATP, NADH and also sufficient amount of RuBP. The regeneration step requires one ATP molecule for phosphorylation. Hence for every CO

$_2$ molecule that enters the into Calvin cycle, 2 molecules of NADH and also 3 molecules of ATP are required. Thus in order to produce one molecule of glucose through the Calvin pathway 12NADPH and 18 ATP is required ( for one glucose, 6 CO

$_2$ is required).

So the correct option is B

Which one shows dimorphic chloroplasts

0%
Mango
0%
Castor
0%
Banyan
0%
Amaranthus

Explanation

Mango, castor, and banyan are monomorphic chloroplasts but amaranthus shows dimorphic chloroplasts in above options. Amaranthus is the C

$_4$ plant which is found in tropical and subtropical regions, these plants show Kranz anatomy. The vascular bundles in C

$_4$ leaves are surrounded by a layer of bundle sheath cells that contain a large number of chloroplasts i.e., they are dimorphic. The chloroplasts of bundle cells are larger in size and are arranged centripetally while the mesophyll cells have the normal type of chloroplasts.
So, the correct option is D.

State whether the following statements are true or false .
The energy currency of a cell is adenosine triphosphate (ATP). ATP is chemically a lipoprotein.

0%
True
0%
False

In the absence of

$NADP^+$ , electrons of photosynthetic electron transport system pass to

0%
Cyt. f
0%
Cyt. $b_6$
0%
Plastocyanin
0%
Quinine

Explanation

In cyclic electron transport pathway:

1. The P $_{700}$ pigment complex absorbs solar energy. They transfer their energy to PS I reaction centre- P $_{700}$ . The outer valance electron of excited P $_{700}$ is raised to a higher energy level which is captured by the primary acceptor of PS I. The primary acceptor transfers electron to ferredoxin.

2. Reduced ferredoxin, unable to reduce NADP $^+$ returns the electron to PS I via cytochrome b $_6$ , plastoquinone (PQ), cytochrome-f and plastocyanin.

3. The electron transport is called cyclic because the electron emitted from PS I returns back to PS I passing through several intermediate carriers.

Hence, the correct answer is 'Cyt.b6'.

A grass which has both

$C_3$ and

$C_4$ ecotypes is

0%
Alloteropsis semi alala
0%
Imperata cylindrica
0%
Cynodon dactylon
0%
Agropyron repens

Explanation

Alloteropsis semialata is also called as black seed grass. It is intermediate of C

$_3$ and C

$_4$ plants. It has both ecotypes. It has less biochemical characteristics of C

$_4$ plants. It shows transition and evolution of C

$_3$ to C

$_4$ plants.

Thus, the correct answer is option A.

During photorespiration which compounds are formed having 2C and 3C respectively in peroxisome?

0%
Phosphoglycerate, glycolate
0%
Glycine, glycerate
0%
Serine, glycine
0%
Glycolate, glycine

Explanation

Glycine and glycerate are formed in peroxisomes, which are

$2$ carbon and

$3$ carbon compound respectively.

A genus which has both

$C_3$ and

$C_4$ species is

0%
Ricinus
0%
Atriplex
0%
Euphorbia
0%
Both B and C

Explanation

Genus like Atriplex, Euphorbia, Flaveria has both C

$_3$ and C

$_4$ species. However, they majorly have C

$_3$ species. Atriplex has C

$_3$ species like Atriplex prostrata and C

$_4$ species like Atriplex rosea. Euphorbia has C

$_3$ species like Euphorbia balsamifera and C

$_4$ species like Euphorbia maculata.

If bundle sheath cells of the C

$_4$ plants are infected by an organism, which utiliseplantsareinfectedbyanorganism,whichutilise CO

$_2$ efficiently then which process will be affected very first?

0%
PGAL + PGA $\to$ Glucose
0%
PGAL $\to$ RuBP
0%
PGA $\to$ PGAL
0%
RuBP $\to$ PGA

Explanation

The bundle-sheath cells in the

$C_4$ plants contain the chloroplast and the enzymes required for the Calvin cycle. RuBisCo is the enzyme which performs the first reaction in the Calvin cycle that is combining the RuBP (Ribulose bisphosphate) to

$CO_2$ to form PGA (3-phosphoglycerate). If the bundle-sheath cells are destroyed as a result of infection, Calvin cycle will not happen. Thus, the correct option is D.

For the same amount of CO

$_2$ fixed, a C

$_4$ plant as compared to C

$_3$ plant losses only

0%
Half amount of water
0%
Double amount of water
0%
Equal amount of water
0%
None of the above

Explanation

A) A

${ C }_{ 4 }$ plant loses half as much as water as a

${ C }_{ 3 }$ plant as

${ C }_{ 4 }$ plants need not to open their stomata for long to take in carbon dioxide due to high efficiency of the

${ C }_{ 4 }$ pathway and this reduces water loss due to transpiration.

${ C }_{ 4 }$ plants lose less water than

${ C }_{ 3 }$ plants.
C)

${ C }_{ 4 }$ plants are more efficient than

${ C }_{ 3}$ plants and lose half as much water.
D)

${ C }_{ 4 }$ plants lose half the amount of water.
So the correct answer is 'Half amount of water'.

How many components listed below are part of cyclic ETS?
P

$_{700}$ , P

$_{680}$ , NADP reductase, hydrogen carrier, PS I, Water Splitting Complex, PS II

0%
Two
0%
Three
0%
Five
0%
Four

Explanation

Cyclic ETS comprises of photosystem I i.e. PS I. The photocentre of PS I is a special chlorophyll-a molecule which is called P

$_{700}$ . Non-cyclic ETS comprises of both photosystem I and photosystem II. The photocentre of PS II is chlorophyll-a which is called P

$_{680}$ . It also consists of water splitting complex in which photolysis of water takes place.

Hence, PS I and P

$_{700}$ are components of cyclic ETS. So, the correct answer is 'Two'.

Read the following statements and find out the incorrect statement.

0%
Glucose is prepared at the source by photosynthesis which is converted to sucrose.
0%
Loading at the source produces a hypotonic condition in phloem.
0%
Loading of the phloem sets up a water potential gradient that facilitates the mass movement in the water.
0%
Phloem tissue is composed of sieve tube cells, which form long columns with holes in their end walls called sieve plates.

How energy transfer takes place in process of photosynthesis ?

0%
Phycocyanin $\rightarrow$ Phycoerythrin $\rightarrow$ Carotenoid $\rightarrow$ Chlorophylls
0%
Chlorophyll-b $\rightarrow$ Carotenoid $\rightarrow$ Phycocyanin $\rightarrow$ Chlorophyll-a
0%
Phycoelythrin $\rightarrow$ Phycocyanin $\rightarrow$ Carotenold $\rightarrow$ Chlorophylka
0%
Chlorophyll-b $\rightarrow$ Carotenoid $\rightarrow$ Otiycoetythrin -4 CNorcphyll-a

This Indian scientist and his group contributed immensely to

$C_4$ photosynthesis research

0%
J.C. Bose .
0%
V.S.Rama Das
0%
P.K.K. Nair
0%
C.G.K Ramanujan

First transitory chemical formed by reaction between CO

$_2$ and RuBP is

0%
PGAL/GAP
0%
2-carboxy, 3-keto, 1-5 biphosphoribotol
0%
PGA
0%
Dihydroxy acetone phosphate

Explanation

During the first phase (carboxylation) of Calvin cycle, RuBP (ribulose - 1-5, biphosphate) combine with CO

$_2$ in the presence of RuBP carboxylase or RuBisCo. This reaction produces a transient (unstable) intermediate compound 2 carboxy 3-keto 1, 5-biphosphoribotol. This intermediate splits up immediately in the presence of water and forms two molecules of 3 phosphoglyceric acid or PGA (first stable product).

So, the correct answer is option B.

Irradiation of a mixture of

$NH_3, CH_4, H_2$ and

$H_2O$ vapour resulted in the formation of adenine. Such experimental evidence supports Oparin's hypothesis on the origin of life because adenine is found in ____.

0%
ATP
0%
RNA
0%
DNA
0%
ATP, RNA and DNA

In the given figure, what are the substances labelled as

$P, Q, R$ and

$S$ ?

0%
P-PGA, Q-Glyoxylate, $R-NH_{3}$ , S-Serine
0%
P-Glycolate, Q-Glyoxylate, $R - NH_{3}$ , S-Serine
0%
P-Glycolate, Q-Glyoxylate, $R - CO_{2}$ , S-Serine
0%
P-RuBP, Q-Glycerate, $R-CO_{2}$ , S-Serine

Explanation

The given diagram represents

$C_2$ cycle or photorespiration. The process has following steps:

•Oxygen binds with RuBP oxygenase and forms phosphoglycolate in chloroplast which gets converted to glycolate and is transported to peroxisomes.

•In peroxisomes it forms glyoxylate and then glycine.

•Glycine then enters the mitochondria and looses

$NH_4$ and

$CO_2$ and forms serine.

•Serine is transported to peroxisomes and in a series of reactions it forms glycerate which gets converted to PGA or Phosphoglyceric Acid and then RuBP in the chloroplast.

So, the correct answer is B.

If 8 carbon atoms have deviated from the Calvin cycle in photorespiration, then what is the total carbon loss that occurs at the end of the reaction:-

0%
100%
0%
75%
0%
25%
0%
0%

PEPcase and RuBiSCO in C

$_{4}$ plants are present respectively in

0%
Cytoplasm and thylakoids
0%
Stroma and cytoplasm
0%
Stroma and thylakoids
0%
Cytoplasm and stroma

Explanation

The leaves of C

$_{4}$ plants showcases the specialized Kranz anatomy i.e., the vascular bundle is surrounded by bundle sheath cells in a ring form which are in turn bound by one or more concentric layers of mesophyll cells. Amospheric CO

$_{2}$ is first accepted by PEP and converted to OAA via PEPcase in the cytoplasm of the mesophyll cells. OAA is further converted to malate and transported from mesophyll to the bundle sheath cells. Malate is decarboxylated to release pyruvate and CO

$_{2}$ ; the CO

$_{2}$ is then fixed by RuBiSCO which is located in the unstacked thylakoids of the bundle sheath cells.

So the correct option is 'Cytoplasm and thylakoids'

Which of the following is not related with photosynthesis in purple sulphur bacteria :-

0%
Requirement of hydrogen doner
0%
Requirement of light
0%
Release of oxygen
0%
Use of atmospheric ${ CO }_{ 2 }$

$CO_{2} : NADPH_{2} : ATP$ ratio for

$C_{3}$ plants is

0%
$1 : 2 : 3$
0%
$1 : 2 : 4$
0%
$1 : 3 : 6$
0%
$1 : 5 : 10$

Explanation

$_{3}$ photosynthesis requires 3 ATP and 2 NADPH molecules for 1 CO

$_{2}$ to be fixed.

So the correct option is '1:2:3'

Consider the process that takes place in the given diagram. How many protons are passed from A to B region for the production of 12 ATP molecules?

0%
12 $H^+$
0%
36 $H^+$
0%
$H^+$
0%
6 $H^+$

Choose the correct answer from the alternatives given.
The end product of the Calvin cycle is

0%
ribulose bisphosphate
0%
phosphoglyceraldehyde (PGAL)
0%
PEP carboxylase (PEP case)
0%
carbon dioxide

Which of the following techniques has been most useful for investigating the Calvin cycle?

0%
Flash light experiment
0%
X-rays technique
0%
Radioactive isotope technique
0%
None of these

Protons

$(H^+)$ accumulate in the thylakoid space during electron transport between photosystems-I and II. The excess of protons in the thylakoid space

0%
enters the photorespiration pathway
0%
converts NADP to NADPH and generates ATP in the process
0%
is small enough to diffuse back out through the lipid bilayer
0%
moves from the thylakoid space by the stroma through an ATP synthase complex channel th generates ATP

Light-driven electron transport in the chloroplast pumps

$H^+$

0%
into the stroma
0%
into the inter membrane space between the two layers of the chloroplast envelope
0%
into the thylakoid space
0%
from NADPH to $CO_2$

The final acceptor of electrons during the noncyclic electron pathway is

0%
PS-I
0%
ATP
0%
PS-II
0%
NADP

Continued evolution of

$O_2$ in suspension of an isolated chloroplast in light in the presence of ferric salt, violate dyes, etc. is called

0%
Oxygenation
0%
Blackmans reaction
0%
Hills reaction
0%
Emerson effect

Choose the correct answer from the alternatives given.
Which of the following statements is not true about

$C_3$ and

$C_4$ plants?

0%
$C_3$ plants are more successful in mild climates than $C_4$ plants
0%
$C_4$ plants contain chloroplasts only in part of their mesophyll cells
0%
$C_3$ plants fix $CO_2$ in the mesophyll cells
0%
$C_3$ plants make glucose in the bundle sheath cells

Choose the correct answer from the alternatives given.
Which of the following statements is not true about the noncyclic electron pathway?

0%
Absorbs photons into photosystem-I
0%
Absorbs photons into photosystem-II
0%
Produces NADPH
0%
Produces carbohydrates through carbon dioxide fixation

During chemiosmotic synthesis of ATP, protons diffuse through

$CF_{0}$ channels that activates ATPase enzyme. As a result, one molecule of ATP is formed when ________ passes through ATPase.

0%
$4H^{+}$
0%
$H^{+}$
0%
$2H^{+}$
0%
$6H^{+}$

Explanation

During chemiosmotic synthesis of ATP, protons diffuse through CFo channels that activates ATPase enzyme. As a result, one molecule of Atp is formed when two hydrogen ions pass through ATPase.

So, the correct option is '

$2H^+$ .

During the Z scheme, electrons excited absorption of light in PSI are transferred to the primary acceptors, and therefore must be replaced. The replacements come directly from

0%
NADP
0%
ATP
0%
PS II
0%
Water

Select the correct option:

The Z scheme of photophosphorylation follows the following sequence:

PS II

$\underset{A}{\rightarrow}e^{-}acceptor\underset{B}{\rightarrow} ETS \underset{B}{\rightarrow}PS \,I\underset{C}{\rightarrow}e^{-} acceptor\underset{D}{\rightarrow}NADP^{+}$
Which of the following option for A, B, C and D transfer of electrons?
A B C D

0%
A-Uphill; B-Downhill; C-Uphill; D-Downhill
0%
A-Downhill; B-Uphill; C-Downhill; D-Uphill
0%
A-Downhill; B-Uphill; C-Uphill; D-Downhill
0%
A-Uphill; B- Downhill; C-Downhill; D-Uphill

Light energy is not used directly or indirectly in which of the following option?

0%
Splitting of ${ H }_{ 2 }O$
0%
To develop proton gradient during photophosphorylation
0%
${ CO }_{ 2 }$ reduction in dark reaction
0%
To develop proton gradient during oxidative photophosphorylation

Explanation

NADH and FADH

$_{2}$ transfer their electrons to molecules near the beginning of the transport chain. As electrons are passed down the chain, they move from a higher to a lower energy level, releasing energy. Some of the energy is used to pump H

$^{+}$ ions, moving them out of the matrix and into the intermembrane space. The energy released in these reactions is captured as a proton gradient, which is then used to make ATP in a process called chemiosmosis. Together, the electron transport chain and chemiosmosis make up oxidative phosphorylation.

So, the correct option is 'To develop proton gradient during oxidative photophosphorylation'.

During photorespiration, when two

$O_2$ molecules react with

$2$ moles of RUBP then how many

$3-PGA$ molecules are formed from

$2$ molecules of

$2$ - phosphoglycolate

0%
$2$
0%
$1$
0%
$3$
0%
$4$

For the synthesis of one molecule of sucrose, how many ATP molecules are required in reduction step of the Calvin cycle?

0%
24 ATP
0%
18 ATP
0%
2 ATP
0%
12 ATP

Light reaction is called Z scheme because

0%
It links the two photosystems in a way that resembles the letter Z
0%
All members are placed according to redox potential value
0%
Splitting of ${ H }_{ 2 }O$ take place here
0%
PS II take participate first than PS I

Read the given statement and select the correct option.
Statement 1: Carboxylation is the most crucial step of Calvin where

$CO_{2}$ is utilised for the carboxylation of RuBP.
Statement 2: Carboxylation is catalysed by the enzyme RuBisCO which results in the formation of two molecules of 3PGA.

0%
Both statement 1 and 2 are correct
0%
Statement 1 is correct but statement 2 is incorrect
0%
Statement 1 is incorrect but statement 2 is correct
0%
Both statement 1 and 2 are incorrect

Explanation

Carboxylation is the fixation of

$CO_{2}$ into a stable organic intermediate. It is the most crucial step of the Calvin cycle where

$CO_{2}$ is utilized for the carboxylation of RuBP through the use of ATP and NADPH generated by the light reaction. This reaction is catalysed by enzyme RuBisCO which results in the formation of two molecules of 3-phosphoglyceric acid or PGA, which is the first stable product of photosynthesis.

RUBISCO enzyme is absent in mesophyll cells in

$C_4$ plants, but present mesophyll cells of

$C_3$ plants.

0%
True
0%
False

Explanation

Ribulose-1,5-bisphosphate carboxylase (RUBISCO) is an enzyme found in the mesophyll cells present within the C

$_3$ plants. In C

$_4$ plants, this enzyme is found in the bundle sheath cells. RUBISCO plays a vital role in carbon fixation during the Calvin cycle. Hence, the statement given is 'True'.

How many ATP and

$NADPH_{2}$ are respectively produced in the process of photorespiration?

0%
2 and 4
0%
1 and 2
0%
4 and 6
0%
0 and 0

Explanation

Photorespiratory pathway (or

$C_{2}$ pathway) results in the release of

$CO_{2}$ with the utilization of ATP. In the photorespiratory pathway, three is no synthesis of ATP or NADPH.

So the correct option is D.

In calvin cycle, the fixation of CO2 into a stable organic intermediate is called...

0%
Carboxylation
0%
Decarboxylation
0%
Kreb's Cycle
0%
Electron Transport

Explanation

The first step of the Calvin cycle is Carboxylation, where CO

$_{2}$ is fixed into a stable organic intermediate. During the process, CO

$_{2}$ is used for the carboxylation of RuBP, via RuBP carboxylase as the catalyst and resulting in the formation of two molecules of 3-PGA.

So the correct option is 'Carboxylation'

The use of [ 14C] radioactive carbon by M. Calvin in algal photosynthesis studies provided

0%
That CO2 will combine with H2O to produce sugar.
0%
That ATP and NADPH were used in the biosynthetic phase.
0%
That first CO2 fixation product was 3-carbon organic acid.
0%
All of the above

What is the product of oxygenase acitivity of Rubisco?

0%
Phosphoglycerate
0%
Phosphoglycolate
0%
Both A and B
0%
Phosphoglyceraldehyde

Which one option have correct mark for A, B, C, D & E:

	A	B	C	D	E
1	LHC II	LHC I	FRS	Pheophytin	NADPH
2	LHC II	LHC I	Chl a without mg	FRS	NADPH
3	LHC I	LHC II	Pheophytin	FRS	ATP
4	LHC II	LHC I	FRS	Phephytin	ATP

0%
1
0%
2
0%
3
0%
4

CBSE Questions for Class 11 Medical Biology Photosynthesis In Higher Plants Quiz 16 - MCQExams.com

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Practice Class 11 Medical Biology Quiz Questions and Answers

CBSE Questions for Class 11 Medical Biology Photosynthesis In Higher Plants Quiz 16 - MCQExams.com

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Practice Class 11 Medical Biology Quiz Questions and Answers

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